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The One-dimensional Chiral Anomaly and its Disorder Response
- Source :
- Phys. Rev. B 108, 195103, Published 2 November 2023
- Publication Year :
- 2023
-
Abstract
- The condensed-matter realization of chiral anomaly has attracted tremendous interest in exploring unexpected phenomena of quantum field theory. Here, we show that one-dimensional (1D) chiral anomaly (i.e., 1D nonconservational chiral current under a background electromagnetic field) can be realized in a generalized Su-Schrieffer-Heeger model where a single gapless Dirac cone occurs. Based on the topological Thouless pump and anomalous dynamics of chiral displacement, we elucidate that such a system possesses the half-integer quantization of winding number. Moreover, we investigate the evolution of 1D chiral anomaly with respect to two typical types of disorder, i.e., on-site disorder and bond disorder. The results show that the on-site disorder tends to smear the gapless Dirac cone. However, we propose a strategy to stabilize the half-integer quantization, facilitating its experimental detection. Furthermore, we demonstrate that the bond disorder causes a unique crossover with disorder-enhanced topological charge pumping, driving the system into a topological Anderson insulator phase.
- Subjects :
- Condensed Matter - Mesoscale and Nanoscale Physics
Quantum Physics
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 108, 195103, Published 2 November 2023
- Publication Type :
- Report
- Accession number :
- edsarx.2302.13556
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.108.195103